Class: BackgroundRenderer

Inherits:
Object
  • Object
show all
Defined in:
src/ruby/background-renderer.rb

Instance Method Summary collapse

Instance Method Details

#darken(c, f = 1.0) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 371

def darken(c, f = 1.0)
    rgb = hex_to_rgb(c)
    rgb[0] *= f
    rgb[1] *= f
    rgb[2] *= f
    rgb_to_hex(rgb)
end

#draw_circle(f, g, p0, p1, p2, m, ld_mode, classes, lines, randomize, r0, alpha, dx, dy, dr) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 216

def draw_circle(f, g, p0, p1, p2, m, ld_mode, classes, lines, randomize, r0, alpha, dx, dy, dr)
    if randomize
        p0[0] += rand(50) - 25
        p0[1] += rand(50) - 25
    end
    x0 = p0[0]; y0 = p0[1]
    x1 = p1[0]; y1 = p1[1]
    x2 = p2[0]; y2 = p2[1]
    mx = (x0 + x1 + x2) / 3.0
    my = (y0 + y1 + y2) / 3.0
    
    tx = mx / 1920.0
    ix = (tx * (g.size - 1)).to_i
    ix = g.size - 2 if ix >= g.size - 1
    ix = 0 if ix < 0
    ix = g.size - 1 if ix >= g.size - 1
    fx = tx * (g.size - 1) - ix
    fx = 0.0 if fx < 0.0
    fx = 1.0 if fx > 1.0
    
    fy = my / 1540.0
#         fy = fy * 0.8 + 0.2
    fy = 0.0 if fy < 0.0
    fy = 1.0 if fy > 1.0
    fy = 3 * fy ** 2 - 2 * fy ** 3
    
    bg_color = ld_mode == 'l' ? [248, 248, 248] : [8, 8, 8]
    # mix RGB
    color = rgb_to_hex(mix(mix(hex_to_rgb(g[ix]), hex_to_rgb(g[ix + 1]), fx), bg_color, fy))
    # mix HSV
#         color = rgb_to_hex(mix(hsv_to_rgb(mix(rgb_to_hsv(hex_to_rgb(g[ix])), rgb_to_hsv(hex_to_rgb(g[ix + 1])), fx)), bg_color, fy))
    if m == 0
#             c1 = 'stroke:none;'
#             c2 = "fill:#000000; filter:url(#blur);"
#             classes[c1] ||= i_to_b62(classes.size)
#             classes[c2] ||= i_to_b62(classes.size)
#             lines << "<circle cx='#{p0[0].to_i}' cy='#{p0[1].to_i}' r='100px' class='c#{classes[c1]} c#{classes[c2]}' />"
    else
        r = r0
        if randomize
            r += rand(20)
        end

        if alpha
            c1 = "stroke:none;"
            c2 = "fill:rgba(#{bg_color.map { |x| x.to_s}.join(',')},0.2);"
            classes[c1] ||= i_to_b62(classes.size)
            classes[c2] ||= i_to_b62(classes.size)
            lines << "<circle cx='#{p0[0].to_i + dx}' cy='#{p0[1].to_i + dy}' r='#{r + dr}' class='c#{classes[c1]} c#{classes[c2]}' />"
        else
            c1 = 'stroke:none;'
            c2 = "fill:#000; fill-opacity:#{sprintf('%1.3f', (1.0 - fy) * (ld_mode == 'l' ? 0.3 : 0.6))}; filter:url(#blur);"
            classes[c1] ||= i_to_b62(classes.size)
            classes[c2] ||= i_to_b62(classes.size)
            lines << "<circle cx='#{p0[0].to_i + dx}' cy='#{p0[1].to_i + dy}' r='#{r + dr}' class='c#{classes[c1]} c#{classes[c2]}' />"

            c1 = 'stroke:none;'
            c2 = "fill:#{color};"
            classes[c1] ||= i_to_b62(classes.size)
            classes[c2] ||= i_to_b62(classes.size)
            lines << "<circle cx='#{p0[0].to_i + dx}' cy='#{p0[1].to_i + dy}' r='#{r + dr}' class='c#{classes[c1]} c#{classes[c2]}' />"
        end
    end
end

#draw_curved_triangle(f, g, p0, p1, p2, p4, p5, p6, p7, p8, p3, m, ld_mode, shadow, curvy, classes, lines) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 136

def draw_curved_triangle(f, g, p0, p1, p2, p4, p5, p6, p7, p8, p3, m, ld_mode, shadow, curvy, classes, lines)
    x0 = p0[0]; y0 = p0[1]
    x1 = p1[0]; y1 = p1[1]
    x2 = p2[0]; y2 = p2[1]
    mx = (x0 + x1 + x2) / 3.0
    my = (y0 + y1 + y2) / 3.0
    t0 = 0.0
    t0 = 0.2 if curvy
#         t0 = 0.4
#         t0 = 0.6
#         t0 = 0.8
    t1 = 1.0 - t0
    p9 = [p6[0] * t0 + p0[0] * t1, p6[1] * t0 + p0[1] * t1]
    pa = [p3[0] * t0 + p1[0] * t1, p3[1] * t0 + p1[1] * t1]
    pb = [p8[0] * t0 + p1[0] * t1, p8[1] * t0 + p1[1] * t1]
    pc = [p5[0] * t0 + p2[0] * t1, p5[1] * t0 + p2[1] * t1]
    pd = [p4[0] * t0 + p2[0] * t1, p4[1] * t0 + p2[1] * t1]
    pe = [p7[0] * t0 + p0[0] * t1, p7[1] * t0 + p0[1] * t1]
    
    tx = mx / 1920.0
    ix = (tx * (g.size - 1)).to_i
    ix = g.size - 2 if ix >= g.size - 1
    ix = 0 if ix < 0
    ix = g.size - 1 if ix >= g.size - 1
    fx = tx * (g.size - 1) - ix
    fx = 0.0 if fx < 0.0
    fx = 1.0 if fx > 1.0
    
    fy = my / 1540.0
#         fy = fy * 0.8 + 0.2
    fy = 0.0 if fy < 0.0
    fy = 1.0 if fy > 1.0
    fy = 3 * fy ** 2 - 2 * fy ** 3
    
    bg_color = ld_mode == 'l' ? [248, 248, 248] : [8, 8, 8]
    # mix RGB
    color = rgb_to_hex(mix(mix(hex_to_rgb(g[ix]), hex_to_rgb(g[ix + 1]), fx), bg_color, fy))
    # mix HSV
#         color = rgb_to_hex(mix(hsv_to_rgb(mix(rgb_to_hsv(hex_to_rgb(g[ix])), rgb_to_hsv(hex_to_rgb(g[ix + 1])), fx)), bg_color, fy))
#         lines << "<circle cx='#{p3[0].to_i}' cy='#{p3[1].to_i}' r='5px' style='fill: #000;'/>"
#         lines << "<circle cx='#{p4[0].to_i}' cy='#{p4[1].to_i}' r='5px' style='fill: #f00;'/>"
#         lines << "<circle cx='#{p5[0].to_i}' cy='#{p5[1].to_i}' r='5px' style='fill: #0f0;'/>"
#         lines << "<circle cx='#{p6[0].to_i}' cy='#{p6[1].to_i}' r='5px' style='fill: #00f;'/>"
#         lines << "<circle cx='#{p7[0].to_i}' cy='#{p7[1].to_i}' r='5px' style='fill: #ff0;'/>"
#         lines << "<circle cx='#{p8[0].to_i}' cy='#{p8[1].to_i}' r='5px' style='fill: #0ff;'/>"
    if m == 0
        c1 = 'fill:none;stroke-width:2px;'
        c2 = "stroke:#{color}"
#             c2 = "stroke:#000"
        classes[c1] ||= i_to_b62(classes.size)
        classes[c2] ||= i_to_b62(classes.size)
#             lines << "<path d='M #{x0.to_i},#{y0.to_i} #{x1.to_i},#{y1.to_i} #{x2.to_i},#{y2.to_i} Z' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p3[0].to_i} #{p3[1].to_i} L#{p0[0].to_i} #{p0[1].to_i},#{p1[0].to_i} #{p1[1].to_i}, #{p6[0].to_i} #{p6[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p5[0].to_i} #{p5[1].to_i} L#{p1[0].to_i} #{p1[1].to_i},#{p2[0].to_i} #{p2[1].to_i}, #{p8[0].to_i} #{p8[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p4[0].to_i} #{p4[1].to_i} L#{p0[0].to_i} #{p0[1].to_i},#{p2[0].to_i} #{p2[1].to_i}, #{p7[0].to_i} #{p7[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p0[0].to_i} #{p0[1].to_i} L#{p9[0].to_i} #{p9[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p1[0].to_i} #{p1[1].to_i} L#{pa[0].to_i} #{pa[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p1[0].to_i} #{p1[1].to_i} L#{pb[0].to_i} #{pb[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p2[0].to_i} #{p2[1].to_i} L#{pc[0].to_i} #{pc[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p2[0].to_i} #{p2[1].to_i} L#{pd[0].to_i} #{pd[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
#             lines << "<path d='M #{p0[0].to_i} #{p0[1].to_i} L#{pe[0].to_i} #{pe[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
        lines << "<path d='M #{p0[0].to_i} #{p0[1].to_i} C#{p9[0].to_i} #{p9[1].to_i},#{pa[0].to_i} #{pa[1].to_i}, #{p1[0].to_i} #{p1[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
        lines << "<path d='M #{p1[0].to_i} #{p1[1].to_i} C#{pb[0].to_i} #{pb[1].to_i},#{pc[0].to_i} #{pc[1].to_i}, #{p2[0].to_i} #{p2[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
        lines << "<path d='M #{p2[0].to_i} #{p2[1].to_i} C#{pd[0].to_i} #{pd[1].to_i},#{pe[0].to_i} #{pe[1].to_i}, #{p0[0].to_i} #{p0[1].to_i}' class='c#{classes[c1]} c#{classes[c2]}' />"
    else
        if shadow == 1
            c1 = 'stroke:none;'
            c2 = "fill:#000; fill-opacity:#{sprintf('%1.3f', (1.0 - fy) * (ld_mode == 'l' ? 0.3 : 0.6))}; filter:url(#blur);"
            classes[c1] ||= i_to_b62(classes.size)
            classes[c2] ||= i_to_b62(classes.size)
            lines << "<path d='M #{p0[0].to_i} #{p0[1].to_i} C#{p9[0].to_i} #{p9[1].to_i},#{pa[0].to_i} #{pa[1].to_i}, #{p1[0].to_i} #{p1[1].to_i}, #{pb[0].to_i} #{pb[1].to_i},#{pc[0].to_i} #{pc[1].to_i}, #{p2[0].to_i} #{p2[1].to_i}, #{pd[0].to_i} #{pd[1].to_i},#{pe[0].to_i} #{pe[1].to_i}, #{p0[0].to_i} #{p0[1].to_i} Z' class='c#{classes[c1]} c#{classes[c2]}' />"
        end
        c1 = 'stroke:none;'
        c2 = "fill:#{color}"
        classes[c1] ||= i_to_b62(classes.size)
        classes[c2] ||= i_to_b62(classes.size)
        lines << "<path d='M #{p0[0].to_i} #{p0[1].to_i} C#{p9[0].to_i} #{p9[1].to_i},#{pa[0].to_i} #{pa[1].to_i}, #{p1[0].to_i} #{p1[1].to_i}, #{pb[0].to_i} #{pb[1].to_i},#{pc[0].to_i} #{pc[1].to_i}, #{p2[0].to_i} #{p2[1].to_i}, #{pd[0].to_i} #{pd[1].to_i},#{pe[0].to_i} #{pe[1].to_i}, #{p0[0].to_i} #{p0[1].to_i} Z' class='c#{classes[c1]} c#{classes[c2]}' />"
    end
end

#draw_ngon(n, f, g, p0, p1, p2, m, ld_mode, shadow, classes, lines, &block) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 281

def draw_ngon(n, f, g, p0, p1, p2, m, ld_mode, shadow, classes, lines, &block)
    x0 = p0[0]; y0 = p0[1]
    x1 = p1[0]; y1 = p1[1]
    x2 = p2[0]; y2 = p2[1]
    mx = (x0 + x1 + x2) / 3.0
    my = (y0 + y1 + y2) / 3.0
    
    tx = mx / 1920.0
    ix = (tx * (g.size - 1)).to_i
    ix = g.size - 2 if ix >= g.size - 1
    ix = 0 if ix < 0
    ix = g.size - 1 if ix >= g.size - 1
    fx = tx * (g.size - 1) - ix
    fx = 0.0 if fx < 0.0
    fx = 1.0 if fx > 1.0
    
    fy = my / 1540.0
#         fy = fy * 0.8 + 0.2
    fy = 0.0 if fy < 0.0
    fy = 1.0 if fy > 1.0
    fy = 3 * fy ** 2 - 2 * fy ** 3
    
    bg_color = ld_mode == 'l' ? [248, 248, 248] : [8, 8, 8]
    # mix RGB
    color = rgb_to_hex(mix(mix(hex_to_rgb(g[ix]), hex_to_rgb(g[ix + 1]), fx), bg_color, fy))
    color = yield(color) if block_given?
    # mix HSV
#         color = rgb_to_hex(mix(hsv_to_rgb(mix(rgb_to_hsv(hex_to_rgb(g[ix])), rgb_to_hsv(hex_to_rgb(g[ix + 1])), fx)), bg_color, fy))
    if m == 0
#             c1 = 'stroke:none;'
#             c2 = "fill:#000000; filter:url(#blur);"
#             classes[c1] ||= i_to_b62(classes.size)
#             classes[c2] ||= i_to_b62(classes.size)
#             lines << "<circle cx='#{p0[0].to_i}' cy='#{p0[1].to_i}' r='100px' class='c#{classes[c1]} c#{classes[c2]}' />"
    else
        
        r = 140
        o = 0.7
        if n == 4
            r = 90
            o = 0.5
        elsif n == 6
            r = 80
            o = 0.44
        end
        passes = []
        passes << 0 if shadow == 1
        passes << 1
        passes.each do |pass|
            c1 = 'stroke:none;'
            c2 = pass == 0 ? "fill:#000; fill-opacity:#{sprintf('%1.3f', (1.0 - fy) * (ld_mode == 'l' ? 0.3 : 0.6))}; filter:url(#blur);" : "fill:#{color};"
#                 if pass == 1
#                     c2 = 'stroke: #000000; fill:none;'
#                 end
            a = (tx - 0.5) * 70
#             a = 0
            classes[c1] ||= i_to_b62(classes.size)
            classes[c2] ||= i_to_b62(classes.size)
            p = []
            (0...n).each do |i|
                x = p0[0] + r * Math.cos((i + o) * Math::PI * 2.0 / n)
                y = p0[1] + r * Math.sin((i + o) * Math::PI * 2.0 / n)
                p << [x, y]
            end
            lines << "<path d='M #{p.map { |_| "#{sprintf('%1.1f', _[0])} #{sprintf('%1.1f', _[1])}"}.join(' ')}' class='c#{classes[c1]} c#{classes[c2]}' transform='translate(#{(p0[0].to_i)}, #{(p0[1].to_i)}) rotate(#{sprintf('%1.1f', a)}) translate(#{-(p0[0].to_i)}, #{-(p0[1].to_i)})' />"
#                 lines << "<rect x='#{p0[0].to_i - r/2}' y='#{p0[1].to_i - r/2}' width='#{r}' height='#{r}px' class='c#{classes[c1]} c#{classes[c2]}' transform='translate(#{(p0[0].to_i)}, #{(p0[1].to_i)}), rotate(#{a}), translate(#{-(p0[0].to_i)}, #{-(p0[1].to_i)})' />"
        end
    end
end

#draw_triangle(f, g, p0, p1, p2, m, ld_mode, classes, lines) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 88

def draw_triangle(f, g, p0, p1, p2, m, ld_mode, classes, lines)
    x0 = p0[0]; y0 = p0[1]
    x1 = p1[0]; y1 = p1[1]
    x2 = p2[0]; y2 = p2[1]
    mx = (x0 + x1 + x2) / 3.0
    my = (y0 + y1 + y2) / 3.0
    
    tx = mx / 1920.0
    ix = (tx * (g.size - 1)).to_i
    ix = g.size - 2 if ix >= g.size - 1
    ix = 0 if ix < 0
    ix = g.size - 1 if ix >= g.size - 1
    fx = tx * (g.size - 1) - ix
    fx = 0.0 if fx < 0.0
    fx = 1.0 if fx > 1.0
    
    fy = my / 1540.0
#         fy = fy * 0.8 + 0.2
    fy = 0.0 if fy < 0.0
    fy = 1.0 if fy > 1.0
    fy = 3 * fy ** 2 - 2 * fy ** 3
    
    bg_color = ld_mode == 'l' ? [248, 248, 248] : [8, 8, 8]
    # mix RGB
    color = rgb_to_hex(mix(mix(hex_to_rgb(g[ix]), hex_to_rgb(g[ix + 1]), fx), bg_color, fy))
    # mix HSV
#         color = rgb_to_hex(mix(hsv_to_rgb(mix(rgb_to_hsv(hex_to_rgb(g[ix])), rgb_to_hsv(hex_to_rgb(g[ix + 1])), fx)), bg_color, fy))
    if m == 0
        c1 = 'fill:none;stroke-width:2px;'
        c2 = "stroke:#{color}"
#             c2 = "stroke:#000"
        classes[c1] ||= i_to_b62(classes.size)
        classes[c2] ||= i_to_b62(classes.size)
        lines << "<path d='M #{x0.to_i},#{y0.to_i} #{x1.to_i},#{y1.to_i} #{x2.to_i},#{y2.to_i} Z' class='c#{classes[c1]} c#{classes[c2]}' />"
    else
        c1 = 'stroke:none;'
        c2 = "fill:rgba(0,0,0,#{sprintf('%1.3f', (1.0 - fy) * 0.2)}); filter:url(#blur);"
        classes[c1] ||= i_to_b62(classes.size)
        classes[c2] ||= i_to_b62(classes.size)
        lines << "<path d='M #{x0.to_i},#{y0.to_i} #{x1.to_i},#{y1.to_i} #{x2.to_i},#{y2.to_i} Z' class='c#{classes[c1]} c#{classes[c2]}' />"
        c1 = 'stroke:none;'
        c2 = "fill:#{color}"
        classes[c1] ||= i_to_b62(classes.size)
        classes[c2] ||= i_to_b62(classes.size)
        lines << "<path d='M #{x0.to_i},#{y0.to_i} #{x1.to_i},#{y1.to_i} #{x2.to_i},#{y2.to_i} Z' class='c#{classes[c1]} c#{classes[c2]}' />"
    end
end

#get_gradient(color, ld_mode = 'l', spread = 1.0) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 351

def get_gradient(color, ld_mode = 'l', spread = 1.0)
    hsv = rgb_to_hsv(hex_to_rgb(color))
    hsv[0] = (hsv[0] + 360 - 60 * spread) % 360
    if ld_mode == 'l'
        hsv[1], hsv[2] = hsv[2], hsv[1]
        hsv[1] = (hsv[1] / 100.0) ** 1.5 * 100.0
    end
    left = rgb_to_hex(hsv_to_rgb(hsv))
    
    hsv = rgb_to_hsv(hex_to_rgb(color))
    hsv[0] = (hsv[0] + 90 * spread) % 360
    if ld_mode == 'l'
        hsv[1], hsv[2] = hsv[2], hsv[1]
        hsv[1] = (hsv[1] / 100.0) ** 1.5 * 100.0
    end
    right = rgb_to_hex(hsv_to_rgb(hsv))

    [left, color, right]
end

#hex_to_rgb(c) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 70

def hex_to_rgb(c)
    r = c[1, 2].downcase.to_i(16)
    g = c[3, 2].downcase.to_i(16)
    b = c[5, 2].downcase.to_i(16)
    [r, g, b]
end

#hsv_to_rgb(c) ⇒ Object

martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically



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# File 'src/ruby/background-renderer.rb', line 17

def hsv_to_rgb(c)
    h, s, v = c[0].to_f/360, c[1].to_f/100, c[2].to_f/100
    h_i = (h*6).to_i
    f = h*6 - h_i
    p = v * (1 - s)
    q = v * (1 - f*s)
    t = v * (1 - (1 - f) * s)
    r, g, b = v, t, p if h_i==0
    r, g, b = q, v, p if h_i==1
    r, g, b = p, v, t if h_i==2
    r, g, b = p, q, v if h_i==3
    r, g, b = t, p, v if h_i==4
    r, g, b = v, p, q if h_i==5
    [(r*255).to_i, (g*255).to_i, (b*255).to_i]
end

#mix(a, b, t) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 77

def mix(a, b, t)
    t1 = 1.0 - t
    return [a[0] * t1 + b[0] * t,
            a[1] * t1 + b[1] * t,
            a[2] * t1 + b[2] * t]
end

#render(palette, user = nil) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 553

def render(palette, user = nil)
    rendered_something = false
    (0..9).each do |style|
        ['l', 'd'].each do |ld_mode|
            out_path = "/gen/bg/bg-#{ld_mode}#{palette[0, 3].join('').gsub('#', '')}#{style}.svg"
            next if File.exist?(out_path)
            rendered_something = true
            STDERR.puts "Rendering #{out_path} for #{user || '(no one in particular)'}"
            render_bg(out_path, "#{ld_mode}#{palette[0, 3].join('').gsub('#', '')}#{style}")
        end
    end
    rendered_something
end

#render_bg(out_path, palette) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 379

def render_bg(out_path, palette)
    style = (palette[19] || '0').to_i
    shadow = style > 1 ? 1 : 0
    ld_mode = palette[0]
    g = ['#' + palette[1, 6], '#' + palette[7, 6], '#' + palette[13, 6]]
    g[1] = rgb_to_hex(mix(hex_to_rgb(g[1]), [255, 255, 255], 0.1))

    height = 1600
    if [8, 9].include?(style)
        height = 2400
    end

    FileUtils.mkpath('/gen/bg')
    STDERR.puts "#{palette} => #{out_path}"
    bg_darken = 0.8
    File.open(out_path, 'w') do |f|
        classes = {}
        lines = []
        bgg = ld_mode == 'l' ? 248 : 8
        bgc = sprintf('#%02x%02x%02x', bgg, bgg, bgg)
        f.puts "<?xml version='1.0' encoding='UTF-8' standalone='no'?>"
        f.puts "<svg xmlns='http://www.w3.org/2000/svg' width='1920' height='#{height}'>"
        f.puts "<defs>"
        f.puts "<linearGradient id='gr1'>"
        f.puts "<stop stop-color='#{g[0]}' offset='0%'/>"
        f.puts "<stop stop-color='#{g[1]}' offset='50%'/>"
        f.puts "<stop stop-color='#{g[2]}' offset='100%'/>"
        f.puts "</linearGradient>"
        f.puts "<linearGradient id='gr2' x1='0' x2='0' y1='0' y2='1'>"
        f.puts "<stop stop-color='#{bgc}' stop-opacity='0' offset='0%'/>"
        f.puts "<stop stop-color='#{bgc}' stop-opacity='1'  offset='100%'/>"
        f.puts "</linearGradient>"
        f.puts "<linearGradient id='gr3'>"
        f.puts "<stop stop-color='#ffffff' stop-opacity='0' offset='0%'/>"
        f.puts "<stop stop-color='#ffffff' stop-opacity='0.15' offset='100%'/>"
        f.puts "</linearGradient>"
        f.puts "<linearGradient id='gr4'>"
        f.puts "<stop stop-color='#000000' stop-opacity='0.1' offset='0%'/>"
        f.puts "<stop stop-color='#000000' stop-opacity='0.0' offset='100%'/>"
        f.puts "</linearGradient>"
        f.puts "</defs>"
        f.puts "<filter id='blur'>"
        f.puts "<feGaussianBlur stdDeviation='5' />"
        f.puts "</filter>"
        f.puts "<rect x='0' y='0' width='1920' height='#{height}' fill='url(#gr1)'/>"
        # f.puts "<rect x='0' y='0' width='1920' height='#{height}' fill='rgba(#{bgg},#{bgg},#{bgg},1)'/>"
        f.puts "<rect x='0' y='0' width='1920' height='#{height}' fill='url(#gr2)'/>"
        if style <= 7
            dx = 115.47
            dy = 100
            dots = []
            y = -300
            shift = 0
            while y < 2000 do
                line = []
                x = 1920.0 / 2.0 - dx * 12 + shift * dx * 0.5
                while x < 2400 do
                    vx = x
                    vy = y
                    phi = rand() * 2.0 * Math::PI
                    r = 0.0
                    if [0].include?(style)
                        r = 30.0
                    end
                    vx = x + r * Math::cos(phi)
                    vy = y + r * Math::sin(phi)
                    line << [vx, vy]
                    x += dx
                end
                dots << line
                y += dy
                shift = (shift + 1) % 2
            end
            [0, 1].each do |mode|
                # 2
                (2...(dots.size - 3)).each do |y|
                    # 2
                    x0 = 0
                    x1 = dots.first.size - 1
                    (2...(dots.first.size - 3)).sort do |a, b|
                        (a - (x1 - x0) / 2.0).abs <=> (b - (x1 - x0) / 2.0).abs
                    end.each do |x|
                        d = y % 2
                        if [0, 1, 2, 3].include?(style)
                            draw_curved_triangle(f, g, 
                                                dots[y][x], dots[y+1][x+d-1], dots[y+1][x+d], 
                                                dots[y-1][x+d], 
                                                dots[y-1][x+d-1], 
                                                dots[y+1][x+d-2], 
                                                dots[y+2][x-1], 
                                                dots[y+2][x+1], 
                                                dots[y+1][x+d+1], 
                                                mode, ld_mode, shadow, style == 3, classes, lines)
                            draw_curved_triangle(f, g, 
                                                dots[y][x], dots[y+1][x+d], dots[y][x+1], 
                                                dots[y-2][x], #2
                                                dots[y+1][x+d-1], 
                                                dots[y+2][x-1], # 1
                                                dots[y+1][x+d+1], # 2
                                                dots[y+1][x+d+2], 
                                                dots[y-1][x+d], # 1
                                                mode, ld_mode, shadow, style == 3, classes, lines)
                        elsif [4, 5, 6].include?(style)
                            n = 3
                            if style == 5
                                n = 4
                            elsif style == 6
                                n = 6
                            end
                            draw_ngon(n, f, g, dots[y][x], dots[y+1][x+d], dots[y][x+1], mode, ld_mode, shadow, classes, lines)
                        elsif style == 7
                            draw_circle(f, g, dots[y][x], dots[y+1][x+d], dots[y][x+1], mode, ld_mode, classes, lines, true, 100, false, 0, 0, 0)
                        end
#                         break
                    end
#                         break
                end
            end
        elsif style == 8
            # (0..50).each do |y|
            #     p = [1920.0/2 + Math.cos(y * 0.2) * 200, 500.0 + Math.sin(y * 0.2) * 200]
            #     r = 1300 - y * 20
            #     lines << "<clipPath id='clip#{y}'>"
            #     lines << "<circle cx='#{p[0].to_i}' cy='#{p[1].to_i}' r='#{r}px' />"
            #     lines << "</clipPath>"
            # end
            # (0..50).each do |y|
            #     p = [1920.0/2 + Math.cos(y * 0.2) * 200, 500.0 + Math.sin(y * 0.2) * 200]
            #     r = 1300 - y * 20
            #     lines << "<g style='clip-path: url(#clip#{y - 1});'>" if y > 0
            #     # lines << "<circle cx='#{p[0].to_i}' cy='#{p[1].to_i}' r='#{r}px' style='fill: rgba(0,0,0,0.05);'/>"
            #     # g2 = g.map { |x| darken(x, 1.0 - y / 51.0)}
            #     draw_circle(f, g, p, p, p, 1, ld_mode, classes, lines, true, r, false)
            # end
            # (0..50).each do |y|
            #     lines << "</g>" if y > 0
            # end
            (0..50).each do |y|
                p = [y / 50.0 * 2400 - 400, 0.0 + rand(500) - 250]
                r = 1000
                # lines << "<g style='clip-path: url(#clip#{y - 1});'>" if y > 0
                # lines << "<circle cx='#{p[0].to_i}' cy='#{p[1].to_i}' r='#{r}px' style='fill: rgba(0,0,0,0.05);'/>"
                # g2 = g.map { |x| darken(x, 1.0 - y / 51.0)}
                draw_circle(f, g, p, p, p, 1, ld_mode, classes, lines, false, r, false, 1800, 1000, 1000)
            end
            lines << "<rect x='0' y='#{height/2}' width='1920' height='#{height/2}' fill='url(#gr2)'/>"
        elsif style == 9
            (-8..8).each do |a|
                cx = 1920.0 / 2 + a * 120
                cy = 400.0 + a * 20
                phi = a * rand(40) + 20.0
                lines << "<g transform='translate(#{cx},#{cy}) rotate(#{phi})'>"
                if ld_mode == 'l'
                    lines << "<rect x='-50' y='-#{height}' width='50' height='#{2*height}' fill='url(#gr3)'/>"
                else
                    lines << "<rect x='0' y='-#{height}' width='50' height='#{2*height}' fill='url(#gr4)'/>"
                end
                lines << "</g>"
            end

            lines << "<rect x='0' y='#{height/2}' width='1920' height='#{height/2}' fill='url(#gr2)'/>"
        end
        f.puts "<style>"
        classes.each_pair do |contents, i|
            f.puts ".c#{i} {#{contents}}"
        end
        f.puts "</style>"
        lines.each do |line|
            f.puts line
        end
        f.puts "</svg>"
    end
end

#rgb_to_hex(c) ⇒ Object 



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# File 'src/ruby/background-renderer.rb', line 84

def rgb_to_hex(c)
    sprintf('#%02x%02x%02x', c[0].to_i, c[1].to_i, c[2].to_i)
end

#rgb_to_hsv(c) ⇒ Object

ntlk.net/2011/11/21/convert-rgb-to-hsb-hsv-in-ruby/



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# File 'src/ruby/background-renderer.rb', line 35

def rgb_to_hsv(c)
    r = c[0] / 255.0
    g = c[1] / 255.0
    b = c[2] / 255.0
    max = [r, g, b].max
    min = [r, g, b].min
    delta = max - min
    v = max * 100

    if (max != 0.0)
        s = delta / max *100
    else
        s = 0.0
    end

    if (s == 0.0)
        h = 0.0
    else
        if (r == max)
        h = (g - b) / delta
        elsif (g == max)
        h = 2 + (b - r) / delta
        elsif (b == max)
        h = 4 + (r - g) / delta
        end

        h *= 60.0

        if (h < 0)
        h += 360.0
        end
    end
    [h, s, v]
end